[問題] 統計一題
Q:Two variables are uncorrelated in all of the cases below,with the exception
of
2 2
(A)∣σxy∣≦∣√σx σy ∣
(B) E(y∣x) = 0
(C) being independent
(D) having a zero covariance
解答是選(A)
可是我的想法是:
獨立一定會無關，但無關不一定會獨立
所以我選(C)
到底是哪出了問題呢?
麻煩請高手幫我解惑一下
感激不盡~
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